Infrastructure of Bridges

1. DEPARTMENT OF
CIVIL ENGINEERING
Infrastructure mainly consisting of
Bridges
Er. Ramprasad Kumawat
M.Tech

2. Bridge
• A bridge is a structure built to span a physical
obstacle (such as a body of water, valley, road,
or rail) without blocking the way underneath.
• It is constructed for the purpose of providing
passage over the obstacle, which is usually
something that is otherwise difficult or
impossible to cross.

3. • There are many different designs of bridges,
each serving a particular purpose and
applicable to different situations.
• Designs of bridges vary depending on factors
such as: the function of the bridge, the nature
of the terrain where the bridge is constructed
and anchored, and the material used to make it
and the funds available to build it.

4. Types of bridges
• Bridges can be categorized in several different
ways.
• Common categories include the type of
structural elements used

5. Structure types
• Bridges may be classified by how the actions
of tension, compression, bending, torsion and s
hear are distributed through their structure.

6. • Beam bridges are horizontal beams supported
at each end by substructure units and can be
either simply supported when the beams only
connect across a single span,
or continuous when the beams are connected
across two or more spans.
• When there are multiple spans, the
intermediate supports are known as piers.

8. • A truss bridge is a bridge whose load-bearing
superstructure is composed of a truss.
• This truss is a structure of connected elements
forming triangular units.
• The connected elements (typically straight)
may be stressed from tension, compression, or
sometimes both in response to dynamic loads.
• Truss bridges are one of the oldest types of
modern bridges.

10. • Cantilever bridges are built using cantilevers—
horizontal beams supported on only one end.
• Most cantilever bridges use a pair
of continuous spans that extend from opposite
sides of the supporting piers to meet at the
center of the obstacle the bridge crosses.

11. • Arch bridges have abutments at each end.
• The weight of the bridge is thrust into
the abutments at either side

12. • Suspension bridges are suspended from cables.
The earliest suspension bridges were made of
ropes or vines covered with pieces of bamboo.
• In modern bridges, the cables hang from
towers that are attached to caissons or
cofferdams.
• The caissons or cofferdams are implanted deep
into the bed of the lake, river or sea.

14. • Cable-stayed bridges, like suspension bridges,
are held up by cables.
• However, in a cable-stayed bridge, less cable is
required and the towers holding the cables are
proportionately higher.

16. • THANKS!